sample: invert the input string

by sii_side

HTML

<input onchange="hanten(this);">

JavaScript

function hanten(E) {
  var A, AA, B, i;

  A = E.value;
  AA = A.length;

  B = ""
  for (i = 0; i <= AA; i++) {
    B += A.charAt(AA - i);
  }
  
  E.value = B;
}